Tube clamp



FIG. 1 is a perspective view of a tube clamp showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left end elevational view thereof;

FIG. 7 is a right end elevational view thereof. 

The ornamental design for a tube clamp, as shown. 